Electric heating unit



Nov. 8, 1932.

R. G. HARE ELECTRIC HEATING UNIT Original Filed Feb. 26, 1929 F .1. I".2: F" {7 L25 9 H H O O Q 0 O Q 0 Q Inflation Rene'dflrre,

Patented Nov. 8, 1932 PATENT ()FFlfiE REN'E G. HARE, OF ARDMOB-E,PENNSYLVANIA ELECTRIC HEATING UNIT Original application filed February26, 1929, Serial No. 342,759. Divided and this application filed January14, 1930. Serial No. 429,673.

My invention relates to an electric heating unit adapt-ed to term thecomponent part of a device such, for example, as a necktie press hereof,in which:

Figure 1 is a plan View illustrating an early stage in the formation ofan electric eating unit embodying the main features of my present ivention;

Fig. 2 is a similar View of an intermediate stage;

Fig. 3 is a similar view of a heating unit in the -al stage of itsfabrication, ready be incorporated in th apparatus in which it i d to beuser, for example, a

Cum,

' an enlarged transverse sectional ting unit, the section bemg 1 of Fig.3;

a nan view of a device used for Fig. 5 is securing the ends of theheating wires to the lead-in wires which device is also adapted '11wires beiig shown in operal erew1th Fig. 0 i y spective view, slightlyonlarge l, oii o device shown in Fig. 5, but without the 7,1 Wassociated therewith;

Referring to drawing, the heating unit there shown comprises preferablythree sheets, 15, 16, and of asbestos or similar insulating material.Arranged between the sheets 15 and 16 is esistance wire 18, whichbeginning near one of the corners, extends preferably lo (finally backand forth,

ends another corner.

The sheets 15 and 16 are united to each other by means of a suitablecement 19, such water or s' -icato of soda solution, in which the w re18 is imbedded when the same sets. The sheets 16 and 17 are also unitedto each other by a cement 20, in a similar manner.

The sheet 16 is preferably made shorter than the sheets 15 and 17 so asto provide apock t in which a member 21, preferably made of a sleet ofvulcanized fibre or the like, is positioned. The member 21 is pr0- vioednear its central portion with two holes and 23; also two holes 24; and25, located short distances from the holes 22 and 28 respectively. Themember 21 is also provided near its respective end portions with struckup tabs or tongues 26 and 27.

The electrical. energy for heating the unit 05 is supplied by a suitablecable 28, comprising a pair of insulated wires 30 and 31. The wire 30extends through the hole 22, from one face to the other of the member21, thence through the other hole 24, beyond which the insulation isremoved, and the wire bent back in hook-like form as at 32.

In like manner, the wire 31 extends through the holes 23 and 25 of themember 21,

and likewise has the insulation removed" and is then wrapped or coiledaround the bared and hook-like end of the wire 30. In like manner, theother end of the resistance wire extends under the tab or tongue 27 ofthe member 21, and is similarly oined to the barod and hook-like end ofthe wire 31.

The member 21, and the wire ends associated therewith hereinbefore setforth, are imbodded in the cement which secures the same in place in thepocket between the ends of tie sheets 15 and 17, said pocket being"provided by reason of the sheet 16 being shorter than the sheets 15 and17.

In fabricating the heating unit the sheet 15 is first placed upon asuitable table, such, for example, as that of the machine of myinvention, described in my application for Letters P21139111, filedFebruary 26, 1929, Serial No. 342,759, of which this application is adivision, being located by means of two groups of pins, one group 35penetrating the sheet near one end thereof, and the other group 36penetrating the sheet near the other end thereof.

The resistance wire 18 being secured at one end to a suitable clampingpost 37, is then arranged on top of the sheet by means of the two groupsof pins 35 and 36, extending longitudinally back and forth over saidsheet 15, and around said pins 35 and 36, and finally being secured toanother clamping post 38 (see Fig. 1).

The sheet, with the wire arranged thereon as above described, is nowcoated with a suitable cement, such as water glass or the like. Thesheet 16 is then placed over the sheet 15 with the wires and cementthereon, and is clamped against the same, the pins 85 and 36 penetratingthe sheet 16, and the parts being held clamped together until the cementsets.

As before noted, the sheet 16 is somewhat shorter in length than thesheet 15, and in the space thus provided the member 21, with the ends ofthe wires 30 and 31 secured therein as hereinbefore described, is placedin position upon the end of the sheet 15 which projects beyond the endof the sheet 16.

The ends of the heating wire 18, being re leased from the clamping posts37 and 38, are brought under the respective struck up portions 26 and27, after which they are coiled around the bared hook-like ends of thewires 30 and 31,130 establish an electrical connection therewith.

The pins 35 and 36 having meanwhile been withdrawn, the exposed surfaceof the sheet 16, as well as the member 21 and the parts associatedtherewith, are coated with the cement, after which the sheet 17 isplaced thereon and clamped in position until the cement sets. Theheating unit, after the cement has set, isthen ready for incorporationin the article (such as a necktie press or the like) in which it is tobe used.

It will be seen that there is thus provided an electric heating unit ofnovel construction and arrangement, which may be readily andexpeditiously made at a minimum of expense.

It will, of course, be understood that various changes and modificationsmay be made without departing from the spirit of my invention.

Having thus described the nature and characteristic features of myinvention, what I claim as new and desire to secure by Letters Patent,is:

1. An electric heating unit comprising three thin flat rigid sheets ofinsulating ma terial cemented to each other, a resistance wire extendingback and forth between two of said sheets and held in place by thecement which holds said sheets together, the intermediate sheet of theheating unit being'shorter than the outer sheets to provide a pocketthered between, lead-in wires, a device for securing said lead-in wirescemented in place in the pocket aforesaid, the ends of the resistancewire being secured to the ends of the lead-in wires, and the endportions of the wires being imbedded in the cement by which the devicefor securing the lead-in wires is held in place.

2. An electric heating unit comprising three thin flat rigid sheets ofinsulating material cemented to each other, a resistance wire extendingback and forth between two of said sheets and held in place by thecement which holds said sheets together, the intermediate sheet of theheating unit being shorter than the outer sheets to provide a pockettherebetween, lead-in wires, a device for securing said lead-in wirescomprising a strip of insulating material cemented in place in thepocket aforesaid, said strip having a plurality of holes through whichthe lead-in wires extend, the ends of the resistance wire being securedto the ends of the'lead-in wires, and the portions of the wiresassociated with the strip being imbedded in the cement by which thestrip is held in place. i

3. An electric heating unit comprising three thin fiat rigid sheets ofinsulating material cemented to each other, a resistance wire extendingback and forth between two of said sheets and held in place by thecement which holds said sheets together, the intermediate sheet of theheating unit being shorter than the outer sheets to provide a pockettherebetween, lead-in wires, a device for securing said lead-in wirescomprising a strip of insulating material cemented in place in thepocket aforesaid, said strip having a plurality of holes through whichthe lead-in wires extend, said strip having tongue portions forconfining the resistance wire near the ends thereof, the ends of theresistance wire being secured to the ends of the lead-in wires, and theportions of the wires associated with the strip being imbedded in thecement by which the strip is held in place:

In testimony whereof, I have hereunto signed my name.

RENE G. HARE.

